CVE-2024-28755
Mbed TLS SSL Session Reset Denial of Service / Forced Version Downgrade
Description
An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. An attacker was able to prevent an Mbed TLS server from establishing any TLS 1.3 connection, potentially resulting in a Denial of Service or forced version downgrade from TLS 1.3 to TLS 1.2.
INFO
Published Date :
April 3, 2024, 3:15 a.m.
Last Modified :
June 10, 2025, 12:41 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-28755.
| URL | Resource |
|---|---|
| https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 | Release Notes |
| https://github.com/hey3e | Not Applicable |
| https://hey3e.github.io | Not Applicable |
| https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ | Vendor Advisory |
| https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 | Release Notes |
| https://github.com/hey3e | Not Applicable |
| https://hey3e.github.io | Not Applicable |
| https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-28755 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-28755 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 10, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (including) 3.6.0 Added Reference Type CVE: https://github.com/hey3e Types: Not Applicable Added Reference Type MITRE: https://github.com/hey3e Types: Not Applicable Added Reference Type CVE: https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 Types: Release Notes Added Reference Type MITRE: https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 Types: Release Notes Added Reference Type CVE: https://hey3e.github.io Types: Not Applicable Added Reference Type MITRE: https://hey3e.github.io Types: Not Applicable Added Reference Type CVE: https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ Types: Vendor Advisory Added Reference Type MITRE: https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ Types: Vendor Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/hey3e Added Reference https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 Added Reference https://hey3e.github.io Added Reference https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 06, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-326 Added CVSS V3.1 CISA-ADP AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Received by [email protected]
Apr. 03, 2024
Action Type Old Value New Value Added Description An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. An attacker was able to prevent an Mbed TLS server from establishing any TLS 1.3 connection, potentially resulting in a Denial of Service or forced version downgrade from TLS 1.3 to TLS 1.2. Added Reference MITRE https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ [No types assigned] Added Reference MITRE https://hey3e.github.io [No types assigned] Added Reference MITRE https://github.com/hey3e [No types assigned] Added Reference MITRE https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-28755 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-28755
weaknesses.